/* 2013-12-10_21:04 chmod函数实例 */
#include "apue.h"
int main(int argc, char *argv[])
{
    struct stat statbuf;
    if (stat("foo", &statbuf) < 0)
        err_sys("stat error for foo");
    if (chmod("foo", (statbuf.st_mode & ~S_IXGRP) | S_ISGID) < 0)
        err_sys("chmod error for foo");
    if (chmod("bar", S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) < 0)
        err_sys("chmod error for bar");
    exit(0);
}
